﻿/* 
   Copyright 2011 LUCA Studios LLC & John Evans

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

namespace LUCAStudios.Silverlight.Controls
{
    using System.Windows;
    using System.Collections.ObjectModel;
    using System.Collections.Specialized;

    /// <summary>
    /// Base class for LUCA UI menu controls
    /// </summary>
    public abstract class MenuBase : ControlBase
    {
        /// <summary>
        /// Constructor
        /// </summary>
        protected MenuBase()
        {
            Children = new ObservableCollection<MenuBase>();
            Children.CollectionChanged += ItemCollectionChanged;
        }

        /// <summary>
        /// Called when the LUCA control is loaded
        /// </summary>
        protected override void OnLoaded()
        {
            base.OnLoaded();

            if (LUCAMenuStripContext == null)
                LUCAMenuStripContext = LUCAMenuStrip.FindLUCAMenuStrip(this);
        }

        /// <summary>
        /// Called when collection changes
        /// </summary>
        /// <param name="e"></param>
        protected virtual void OnCollectionChanged(NotifyCollectionChangedEventArgs e) { }

        private void ItemCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
        {
            OnCollectionChanged(e);
        }

        /// <summary>
        /// A backing property for the Children Dependency Property
        /// </summary>
        public static readonly DependencyProperty ChildrenProperty =
                DependencyProperty.Register("Children", typeof(ObservableCollection<MenuBase>),
                                        typeof(MenuBase), new PropertyMetadata(null));

        /// <summary>
        /// Holds a collection of MenuBase controls
        /// </summary>
        public ObservableCollection<MenuBase> Children
        {
            get { return (ObservableCollection<MenuBase>)GetValue(ChildrenProperty); }
            set { SetValue(ChildrenProperty, value); }
        }

        internal MenuBase ParentMenuElement { get; set; }
        internal LUCAMenuStrip LUCAMenuStripContext { get; set; }
    }
}
